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10 Cards in this Set
- Front
- Back
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what is dmitri mendeleeve story on how he created the PTE
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he cut out flashcards and orderd them but there were three empty gaps and he named the properties that would go in the slots and later the elements wheree discovered and fit perfectly into mendeleeves PTE
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if you know the the number of protons you also know ________?
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atomic number
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how do you find the number of neutrons in an atom
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atomic number - atomic mass
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where is the symbol located in an element box
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middle second peice written
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what were the three missing elements dmitri didnt have filled out in his PTE
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Gallium (31) Germanium (32)
Scandium (21) |
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how is the current pte organized
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1 atomic number
2 by properties |
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How was dmitri's PTE organized
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1 atomic mass
2 by properties |
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how many groups/collumns/families are in the PTE
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18
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How many periods/rows are in the PTE
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7
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The atomic number is also the
__________? |
number of electrons
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